import collections
from replication import ReplicatedDatablock

class ReplicationGraph(collections.MutableMapping):
    """
    Structure to hold replicated data relation graph
    """

    def __init__(self, *args, **kwargs):
        self.store = dict()
        self.update(dict(*args, **kwargs))  # use the free update to set keys

    def __getitem__(self, key):
        return self.store[key]

    def __setitem__(self, key, value):
        self.store[key] = value

    def __delitem__(self, key):
        del self.store[key]

    def __iter__(self):
        return iter(self.store)

    def __len__(self):
        return len(self.store)

    def __repr__(self):
        str = "\n"
        for key,item in self.store.items():
            str+=repr(item)
        return str